Originally posted by Raplex
I just installed windows 7 64 bit.But now i cant see my other disks.Cuz they are 32 bit.
That is NOT the reason. You will also need to describe the problem better.
For starters, check Device Manager (devmgmt.msc) for any "unknown" devices, in case you had some sort of storage controller that wasn't recognized out of the box. This is unlikely, however.
Next, check Disk Management (diskmgmt.msc). See if your missing disks/partitions show up there and you can assign them drive letters. If you see them there but can't figure out what to do, you may want to take a screenshot and post it here.